Population Density And Growth Of Taiwan Kijing (Anodonta Woodiana) In The Simangayat River And Samak Reservoir City Pinang Regency Labuhanbatu Selatan Province North Sumatra Province

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Population Density and Growth of Taiwan Kijing (Anodonta Woodiana) in the Simangayat River and Samak Reservoir City Pinang, Labuhanbatu Selatan Regency, North Sumatra Province

Introduction

The Simangayat River and the Samak Reservoir are two vital water bodies in the North Sumatra Province, Indonesia, that are home to the Taiwan Kijing (Anodonta Woodiana). This freshwater mussel species plays a crucial role in maintaining the ecological balance of aquatic ecosystems. However, the population density and growth patterns of Taiwan Kijing in these two locations have not been extensively studied. This research aims to investigate the population density, growth patterns, growth parameters, and the relationship between the density of the Taiwan Kijing population and water quality in both locations.

Methodology

The study employed a purposive sampling method, where a total of 1456 Taiwan Kijing individuals were collected from both locations between September and November 2022. The research sites were selected based on their accessibility and the presence of suitable habitats for the Taiwan Kijing. The collected data included the length, weight, and shell characteristics of the mussels.

Results

The results showed that the density of the Taiwan Kijing population in the Simangayat River was significantly higher than in the Samak Reservoir, with a density of 33,870 individuals per hectare and 3,703 individuals per hectare, respectively. The length frequency distribution of the Taiwan Kijing ranged from 11 to 202 mm, indicating a wide range of sizes in both populations. The growth pattern analysis revealed a negative allometric growth pattern in both locations, where the length growth was relatively slower than the weight growth.

Growth Parameters

The growth parameters, including the growth coefficient (K), asymptotic length (L∞), and theoretical age of the shell at a zero length (T0), were analyzed for both locations. The results showed that the K value for the Simangayat River was 1.51 per year, L∞ was 144.7 mm, and T0 was -1.17 years. In contrast, the Samak Reservoir had a K value of 1.3 per year, L∞ was 148.3 mm, and T0 was -1.10 years.

Relationship between Population Density and Water Quality

The analysis of the relationship between the density of the Taiwan Kijing population and water quality revealed several significant correlations. The current and pH parameters showed a positive relationship with the population density, indicating that sufficient currents and stable pH levels are essential for the growth and survival of the Taiwan Kijing. Conversely, temperature, depth, brightness, dissolved oxygen (DO), and C-organic showed a negative relationship with the population density, suggesting that these factors may limit the growth and survival of the Taiwan Kijing.

Discussion

The higher density of the Taiwan Kijing population in the Simangayat River can be attributed to the more supportive ecosystem, including better currents and more optimal water quality. In contrast, the Samak Reservoir, with its calmer current and less than optimal water quality, may limit the density of the Kijing population. The negative allometric growth pattern found in both locations suggests that environmental factors, such as the availability of feed, competition with other species, or changing habitat conditions, may influence the growth and survival of the Taiwan Kijing.

Conclusion

This research provides valuable insights into the dynamics of the Taiwan Kijing population in the Simangayat River and the Samak Reservoir. The findings highlight the importance of environmental factors, such as currents and pH levels, in supporting the growth and survival of the Taiwan Kijing. The results of this study can inform the management of water resources and species conservation in the future, enabling the development of effective strategies to maintain the sustainability of aquatic ecosystems in the area.

Recommendations

Based on the findings of this study, the following recommendations are made:

  1. Conservation efforts: The results of this study highlight the importance of conserving the Taiwan Kijing population in the Simangayat River and the Samak Reservoir. Efforts should be made to protect the habitats of these mussels and maintain the quality of the water.
  2. Water management: The study suggests that the management of water resources in the Simangayat River and the Samak Reservoir should prioritize the maintenance of optimal water quality and currents.
  3. Monitoring and research: Regular monitoring and research should be conducted to track the population density and growth patterns of the Taiwan Kijing in both locations.
  4. Education and awareness: Educational programs and awareness campaigns should be implemented to raise awareness about the importance of conserving the Taiwan Kijing population and the role of environmental factors in supporting their growth and survival.

By implementing these recommendations, we can work towards maintaining the sustainability of aquatic ecosystems in the area and ensuring the long-term conservation of the Taiwan Kijing population.
Frequently Asked Questions (FAQs) about the Population Density and Growth of Taiwan Kijing (Anodonta Woodiana) in the Simangayat River and Samak Reservoir

Q: What is the Taiwan Kijing (Anodonta Woodiana)?

A: The Taiwan Kijing (Anodonta Woodiana) is a species of freshwater mussel that is native to Asia. It is a type of bivalve mollusk that plays a crucial role in maintaining the ecological balance of aquatic ecosystems.

Q: What is the purpose of this study?

A: The purpose of this study is to investigate the population density, growth patterns, growth parameters, and the relationship between the density of the Taiwan Kijing population and water quality in the Simangayat River and the Samak Reservoir.

Q: What were the main findings of this study?

A: The main findings of this study include:

  • The density of the Taiwan Kijing population in the Simangayat River was significantly higher than in the Samak Reservoir.
  • The growth pattern analysis revealed a negative allometric growth pattern in both locations.
  • The growth parameters, including the growth coefficient (K), asymptotic length (L∞), and theoretical age of the shell at a zero length (T0), were analyzed for both locations.
  • The analysis of the relationship between the density of the Taiwan Kijing population and water quality revealed several significant correlations.

Q: What are the implications of this study?

A: The implications of this study are:

  • The results highlight the importance of conserving the Taiwan Kijing population in the Simangayat River and the Samak Reservoir.
  • The study suggests that the management of water resources in the Simangayat River and the Samak Reservoir should prioritize the maintenance of optimal water quality and currents.
  • Regular monitoring and research should be conducted to track the population density and growth patterns of the Taiwan Kijing in both locations.

Q: What are the recommendations of this study?

A: The recommendations of this study include:

  • Conservation efforts should be made to protect the habitats of the Taiwan Kijing and maintain the quality of the water.
  • Water management should prioritize the maintenance of optimal water quality and currents.
  • Regular monitoring and research should be conducted to track the population density and growth patterns of the Taiwan Kijing in both locations.
  • Educational programs and awareness campaigns should be implemented to raise awareness about the importance of conserving the Taiwan Kijing population and the role of environmental factors in supporting their growth and survival.

Q: What are the limitations of this study?

A: The limitations of this study include:

  • The study was conducted in a limited area and may not be representative of the entire population of Taiwan Kijing.
  • The study did not investigate the impact of other environmental factors, such as pollution and climate change, on the population density and growth patterns of the Taiwan Kijing.

Q: What are the future directions of this study?

A: The future directions of this study include:

  • Conducting further research to investigate the impact of other environmental factors on the population density and growth patterns of the Taiwan Kijing.
  • Expanding the study to include other locations and species of freshwater mussels.
  • Developing and implementing conservation and management strategies to protect the Taiwan Kijing population and maintain the sustainability of aquatic ecosystems.

Q: What are the implications of this study for conservation and management?

A: The implications of this study for conservation and management are:

  • The results highlight the importance of conserving the Taiwan Kijing population and maintaining the quality of the water.
  • The study suggests that conservation and management efforts should prioritize the maintenance of optimal water quality and currents.
  • Regular monitoring and research should be conducted to track the population density and growth patterns of the Taiwan Kijing in both locations.

Q: What are the implications of this study for education and awareness?

A: The implications of this study for education and awareness are:

  • The results highlight the importance of educating the public about the importance of conserving the Taiwan Kijing population and the role of environmental factors in supporting their growth and survival.
  • Educational programs and awareness campaigns should be implemented to raise awareness about the importance of conserving the Taiwan Kijing population and the role of environmental factors in supporting their growth and survival.